diff --git a/dao/sum.js b/dao/sum.js
index 6fb269a24d5c9c73736fc194d45ada157efec44b..f97beadeceaa14871189f7fa4337672d0fddc731 100644
--- a/dao/sum.js
+++ b/dao/sum.js
@@ -1,4 +1,4 @@
 function sum(a, b) {
-  return a + b;
+  return a - b;
 }
-module.exports = sum;
\ No newline at end of file
+module.exports = sum;
diff --git a/server.js b/server.js
index b0027a06551346a1cfa15723c50c8464d912ad5b..b6a7423da58b8193a996de0c0f4b97180a84f8cf 100644
--- a/server.js
+++ b/server.js
@@ -47,7 +47,7 @@ app.delete("/person/:personId"), (req, res) => {
         res.status(status);
         res.json(data);
     });
-}
+};
 
 app.put("/person/:personId"), (req, res) => {
     console.log("Updating person :personId");
@@ -55,6 +55,6 @@ app.put("/person/:personId"), (req, res) => {
         res.status(status);
         res.json(data);
     });
-}
+};
 
 var server = app.listen(8080);